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Synchronous Reactance (in a generator analysis domain) is and equivalent series per-phase inductance term (think per-phase winding resistance) and is mainly composed of the machine's per-phase leakage inductance (equivalent series inductance of primary and secondary flux leakage) and armature reaction (distortion in flux introduced by an armature current in a machine, once again on a per-phase basis; described as a series inductance). L_SyncReac=L_leakage+L_ArmatureReaction. That sort of touches the surface of synchronous reactance.
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What is Direct axis transient reactance?
Direct axis transient reactance, often denoted as X'd, refers to the reactance of a synchronous machine during transient conditions when the rotor angle changes, such as during sudden disturbances or faults. It represents the machine's ability to produce or absorb reactive power in response to these transients. This reactance is typically lower than the synchronous reactance (Xd), allowing for a quicker response to changes in load or system conditions. Understanding direct axis transient reactance is crucial for analyzing the stability and dynamic performance of power systems.
Why synchronous impedance is not a constant?
Synchronous impedance is not a constant because it varies with operating conditions such as load, frequency, and machine construction. It is defined as the ratio of the voltage to the current at synchronous speed, but this relationship changes depending on the reactance and resistance of the machine as well as the power factor of the load. Additionally, factors such as saturation of magnetic materials and temperature can also influence synchronous impedance, leading to variations in its value.
Why we determine Xd and Xq synchronous machine?
Xd (synchronous reactance in the direct axis) and Xq (synchronous reactance in the quadrature axis) are determined for synchronous machines to analyze their performance under different operating conditions. Xd is crucial for understanding the machine's behavior during steady-state operation and when supplying or absorbing reactive power, while Xq is important for evaluating the machine's response to load changes and transient stability. These parameters help in the design of control systems and in the stability analysis of power systems. Knowing Xd and Xq allows engineers to effectively model and predict the machine's performance in various scenarios.
What does capacitive reactance oppose?
Inductive reactance.
What is the symbol for inductive reactance?
Inductive reactance does NOT have it own sign or symbol. Rather, it uses Ohms as a quantifier. But Capacitive reactance ALSO uses Ohms as a quantifier. Fortunately, 1 Ohm of Inductive reactance is cancelled by 1 Ohm of Capacitive reactance at the same frequency of measurement.
What is synchronous reactance in alternator?
The overall reactance of the armature winding is the sum of its leakage reactance plus fictitious reactance, which is known as synchronous reactance (Xs).Xs=XL+Xarwhere XL and Xar are in Ω/phase. Therefore, Xs is in Ω/phase.The impedance of armature winding is obtained by combining its resistance and its synchronous reactance.
What is Direct axis transient reactance?
Direct axis transient reactance, often denoted as X'd, refers to the reactance of a synchronous machine during transient conditions when the rotor angle changes, such as during sudden disturbances or faults. It represents the machine's ability to produce or absorb reactive power in response to these transients. This reactance is typically lower than the synchronous reactance (Xd), allowing for a quicker response to changes in load or system conditions. Understanding direct axis transient reactance is crucial for analyzing the stability and dynamic performance of power systems.
What has the author Kamal Koshal written?
Kamal Koshal has written: 'Direct and quadrature-axis synchronous reactance measurement'
In order to reduce inductive reactance what devices are normally placed on transmission or distribution lines?
== == Add a capacitor or a synchronous motor or a phase advancer to the transmission line so that it can nullify the effect of inductive reactance since the above elements gives capacitive reactance. Doing this also improves the power factor.
Why synchronous impedance is not a constant?
Synchronous impedance is not a constant because it varies with operating conditions such as load, frequency, and machine construction. It is defined as the ratio of the voltage to the current at synchronous speed, but this relationship changes depending on the reactance and resistance of the machine as well as the power factor of the load. Additionally, factors such as saturation of magnetic materials and temperature can also influence synchronous impedance, leading to variations in its value.
What is the formula for excitation voltage?
E=Vt + Ia jXS Where E excitation voltage Vt Terminal voltage Stator Current Ia Xs synchronous Reactance
Why we determine Xd and Xq synchronous machine?
Xd (synchronous reactance in the direct axis) and Xq (synchronous reactance in the quadrature axis) are determined for synchronous machines to analyze their performance under different operating conditions. Xd is crucial for understanding the machine's behavior during steady-state operation and when supplying or absorbing reactive power, while Xq is important for evaluating the machine's response to load changes and transient stability. These parameters help in the design of control systems and in the stability analysis of power systems. Knowing Xd and Xq allows engineers to effectively model and predict the machine's performance in various scenarios.
What is the unit of inductive reactance?
Inductive reactance, as well as capacitive reactance, is measured in ohms.
What does capacitive reactance oppose?
Inductive reactance.
What is synchronous machein?
mainly alternator,synchronous motor comes under the synchronous machine.a synchronous motor is not a self starting motor.if a synchronous motor moves with more than synchronous speed then it acts as a synchronous generator.
What is the Quantity Symbol for Reactance?
The quantity symbol for reactance is X.
What is the inverse of reactance?
The reciprocal of reactance is susceptance, expressed in siemens.
